Modified Mastering Physics with Pearson eText -- Standalone Access Card -- for Conceptual Integrated Science
3rd Edition
ISBN: 9780135213339
Author: Hewitt, Paul, Suchocki, John, LYONS, Suzanne, Yeh, Jennifer
Publisher: PEARSON
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Chapter 16, Problem 29TIS
Why is DNA described as a double helix?
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Portfolio Problem 4. Consider two identical springs, each with natural length
and spring constant k, attached to a horizontal frame at distance 2l apart. Their
free ends are attached to the same particle of mass m, which is hanging under
gravity. Let z denote the vertical displacement of the particle from the hori-
zontal frame, so that z < 0 when the particle is below the frame, as shown in
the figure. The particle has zero horizontal velocity, so that the motion is one
dimensional along z.
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(a) Show that the total force acting on the particle is
X
F-mg k-2kz 1
(1.
l
k.
(b) Find the potential energy U(x, y, z) of the system such that U
x = : 0.
= O when
(c) The particle is pulled down until the springs are each of length 3l, and then
released. Find the velocity of the particle when it crosses z = 0.
In the figure below, a semicircular conductor of radius R = 0.260 m is rotated about the axis AC at a constant rate of 130 rev/min. A uniform magnetic field of magnitude 1.22 T fills the entire region below the axis and is directed out of the page.
R
Pout
(a) Calculate the maximum value of the emf induced between the ends of the conductor.
1.77
v
(b) What is the value of the average induced emf for each complete rotation?
0
v
(c) How would your answers to parts (a) and (b) change if the magnetic field were allowed to extend a distance R above the axis of rotation? (Select all that apply.)
The value in part (a) would increase.
The value in part (a) would remain the same.
The value in part (a) would decrease.
The value in part (b) would increase.
The value in part (b) would remain the same.
The value in part (b) would decrease.
×
(d) Sketch the emf versus time when the field is as drawn in the figure. Choose File No file chosen
This answer has not been graded yet.
(e) Sketch the emf…
Portfolio Problem 2. A particle of mass m slides in a straight line (say along i)
on a surface, with initial position x ©0 and initial velocity Vo > 0 at t = 0. The
=
particle is subject to a constant force F = -mai, with a > 0.
While sliding on the surface, the particle is also subject to a friction force
v
Ff
= -m fo
= −m fov,
with fo > 0, i.e., the friction force has constant magnitude mfo and is always
opposed to the motion. We also assume fo 0, and solve it to find v(t) and x(t).
How long does it take for the particle to come to a stop? How far does it travel?
(b) After coming to a stop, the particle starts sliding backwards with negative
velocity. Write the equation of motion in this case, and solve it to find the time
at which the particle returns to the original position, x = 0. Show that the final
speed at x 0 is smaller than Vo.
=
Express all your answers in terms of a, fo and Vo.
Chapter 16 Solutions
Modified Mastering Physics with Pearson eText -- Standalone Access Card -- for Conceptual Integrated Science
Ch. 16 - What is a gene?Ch. 16 - Why do proteins determine many of an organisms...Ch. 16 - How is DNA packaged into chromosomes?Ch. 16 - What is the difference between a diploid cell and...Ch. 16 - How is DNA copied?Ch. 16 - Prob. 6RCCCh. 16 - How does RNA differ from DNA?Ch. 16 - Prob. 8RCCCh. 16 - What is a codon?Ch. 16 - Describe the role of tRNA in translation.
Ch. 16 - What are the two main causes of genetic mutations?Ch. 16 - What is a point mutation?Ch. 16 - What is a frameshift mutation, and what is its...Ch. 16 - What is crossing over? Why is crossing over...Ch. 16 - What are the products of meiosis?Ch. 16 - What is the difference between a dominant trait...Ch. 16 - Prob. 17RCCCh. 16 - Prob. 18RCCCh. 16 - Prob. 19RCCCh. 16 - What is pleiotropy?Ch. 16 - How many genes does a human have?Ch. 16 - What is an SNP?Ch. 16 - Is cancer usually the result of a single genetic...Ch. 16 - What does it mean for a cancer to have...Ch. 16 - Prob. 25RCCCh. 16 - Use examples to describe how genetically modified...Ch. 16 - Prob. 27RCCCh. 16 - Describe some of the safety, social, and ethical...Ch. 16 - Why is DNA described as a double helix?Ch. 16 - How is DNA like a ladder? What are the sides of...Ch. 16 - What are the four nucleotides found in DNA? How do...Ch. 16 - Prob. 32TISCh. 16 - Why can very high temperatures be a problem for...Ch. 16 - Prob. 34TISCh. 16 - Explain how DNA is damaged by exposure to...Ch. 16 - Which cells are most vulnerable to ionizing...Ch. 16 - Why is radiation used to treat some forms of...Ch. 16 - Prob. 38TISCh. 16 - Prob. 39TISCh. 16 - Prob. 43TCCh. 16 - Lets assume that human height is a polygenic trait...Ch. 16 - Prob. 45TCCh. 16 - If an organisms diploid cells have 64 chromosomes,...Ch. 16 - One strand of DNA has the nucleotide sequence...Ch. 16 - A section of DNA with the nucleotide sequence...Ch. 16 - Suppose an mRNA molecule with the nucleotide...Ch. 16 - Suppose an mRNA molecule has the nucleotide...Ch. 16 - Suppose an mRNA molecule has the nucleotide...Ch. 16 - You have a pea plant with round seeds. Can you say...Ch. 16 - A woman carries an allele for red-green...Ch. 16 - What is the difference between genotype and...Ch. 16 - Prob. 55TECh. 16 - Is your finger made of diploid cells or haploid...Ch. 16 - Why do some of your cells have only 23 chromosomes...Ch. 16 - What kind of sex chromosomes do you have? Where in...Ch. 16 - Do different types of cells in your body have...Ch. 16 - Prob. 60TECh. 16 - Prob. 61TECh. 16 - Prob. 62TECh. 16 - Explain why scientists initially thought that...Ch. 16 - Prob. 64TECh. 16 - When DNA is copied, why isnt there an old molecule...Ch. 16 - Prob. 66TECh. 16 - How is transcription similar to DNA replication?...Ch. 16 - We compared mRNA processing to editing aggfr...Ch. 16 - Prob. 69TECh. 16 - Prob. 70TECh. 16 - Are point mutations in the first, second, and...Ch. 16 - Why is a frameshift mutation more likely to...Ch. 16 - You are studying two different mutations in a gene...Ch. 16 - You are studying two different mutations in a gene...Ch. 16 - Prob. 75TECh. 16 - Survivors of the atomic bombs in Hiroshima and...Ch. 16 - How can the same two parents produce children that...Ch. 16 - Prob. 78TECh. 16 - Prob. 79TECh. 16 - Explain how a trait can skip generations.Ch. 16 - If you have dimples, will all your children have...Ch. 16 - Is it possible for two parents with widows peaks...Ch. 16 - Prob. 83TECh. 16 - You are in an accident and you need a blood...Ch. 16 - Universal receivers are people who can safely...Ch. 16 - Why are there more color-blind men than...Ch. 16 - Does all your DNA code for proteins?Ch. 16 - Prob. 88TECh. 16 - Cancer is caused by genes gone awryyet cancer is...Ch. 16 - Are older people or younger people more likely to...Ch. 16 - Prob. 91TECh. 16 - Prob. 92TECh. 16 - Prob. 93TECh. 16 - How can genetic engineering help humans adapt to...Ch. 16 - How might genetic engineering affect the human...Ch. 16 - What is a superweed? Explain the benefits and...Ch. 16 - Write a letter to Grandpa telling him about...Ch. 16 - What are the three types of RNA, and what is the...Ch. 16 - You friend Stacie says, I understand how a point...Ch. 16 - Listen to this, your friend says, reading from a...Ch. 16 - Does the process of meiosis explain Mendels two...Ch. 16 - In the case of linked genes, explain why two genes...Ch. 16 - You learned that when red snapdragons are bred...Ch. 16 - Artemisinin is a powerful antimalaria drug....Ch. 16 - Prob. 105TDICh. 16 - If an organisms haploid cells have 10 chromosomes,...Ch. 16 - One strand of DNA has the sequence AGCCTG. The...Ch. 16 - Prob. 3RATCh. 16 - Which type of mutation describes the substitution...Ch. 16 - Prob. 5RATCh. 16 - In humans, having dimples is a dominant trait...Ch. 16 - Prob. 7RATCh. 16 - More than 99.9 of the human genome a carries...Ch. 16 - Prob. 9RATCh. 16 - Prob. 10RAT
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